Gluing mechanism for box-making machines



July 4, 1944 c. D. KNowLroN 2,352,720

GLING MECHANISM FOR BOX-MAVKING MACHINES Filed June 20, 1942 4Sheets-Sheet l July 4, 1944.

C. D. KNOWLTON GLUING MECHANISM FOR Box-MAKING MACHINES Filed June 2o,1942 4 sheets-sheet 2 July 4, 1944. c. D. KNowLToN GLUING MECHANISM FORBOX-MAKING MACHINES Filed June zo, 1942 4 Sheets-Sheet 5 July 4, 1944.

C. D. KNOWLTON GLUING MECHANISM FOR Box-MAKING MACHINES Filed June 20,1942 4 Sheets-Sheet 4 Y VE N T i@ Patented July 4, 1944 GLUING MECHANISMFon BX-MAKING Maonmas Cutler D. Knowlton, Rockport, Mass., assignor toHoague-Sprague Corporation, Lynn, Mass., a corporation of MassachusettsK Application June 20, 1942, Serial No. 447,843

1s claims. '(ol. en -49) This invention relates to a machine for theforming and pressing of such articles as paper boxes and is directedespecially to adhesive-applying mechanism for such machines.

In my prior machine, as disclosed in my application for United StatesLetters Patent ySerial No. 410,274, filed September 10, 1941, box-blanksof the type in which the end formation consists of corner-laps, anend-wing, and an infolded extension for the end-wing are operated uponby a series of mechanisms designed to apply adhesive to the inner faceof an end-wing and its extension, thereafter to fold the end-wing intoengagement with the corner-laps and the extension over the edges of thecorner-laps so that it adheres to the inside surfaces, and, finally, toapply pressure to the superposed parts to cause permanent adhesion. Asshown herein, the corner-laps are partially folded inwardly by theoperator and the box is placed end down, that is, with its longdimension in a substantially vertical position, upon a tablel or guidehaving an upwardly directed terminal extension which completes thefolding' of the corner-laps. In this vertical position the blank isadvanced along the table, with the end-wing extending downwardly in avertical plane, to adhesive-applying mechanism which consists of avertically disposed adhesive-applying roll and a co-operatingpressure-applying roll for holding the end-wing in contact with theadhesive-applying roll.

It is an object of the present invention to provide an improved supportfor the adhesive-applying roll employed in the aforesaid machine, toprovide for more accurate control of the adhesive on the applying roll,to eliminate spatter, and to simplify the construction and arrangementof the control of the adhesive, a doctor blade is held in contact withthe surface of the applying roll, between the point on its surf ace towhich the adhesive is supplied and the point of contact with the work,to spread the adhesive in a uniform lm for application to the inner faceof the end- -wing of a box. Means is also provided for adjusting theposition of the doctor blade to regulate the thickness of the film, andvalve means is provided for by-passing a portion of the adhesive whichis elevated through the passage in order to regulate the amount ofadhesive delivered to the top of the applying roll. It is to be observedthat by using a doctor blade instead of a doctor roll for controllingand governing the thickness of the film of adhesive on the surface ofthe applying roll, the spatter which accompanies the breaking of threadsof adhesive formed between the retreating surfaces of the applying rolland the doctor roll is eliminated. This is due to the fact that thethreads which are produced by the movement of the applying roll awayfrom the doctor blade are drawn out so nearly tangent to the surface ofthe applying roll that they coalesce with the adhesive on the surface ofthel roll before they have an opportunity to break and thus spatter overthe work and onto parts of the machine.

'I'he details of the improved construction of the aforesaid machine willnow be described with reference `to the accompanying drawings, in whichFig. 1 is a side elevation of my prior machine, showing the dispositionof my improved adhesive-applying mechanism;

Fig. 2 is an ang'ular view of a box-blank of the type operated upon,with the corner-laps mechanism in order to minimize manufacturing costs.

In the accomplishment of these objects, the adhesive-applying roll issupported at its lower end in an adhesive receptacle for rotation abouta vertical axis and is partially surrounded along one side and the backby a block having a substantially cylindrical recess conforming to thesurface of the roll. As illustrated, the block supports the roll againstlateral pressure applied thereto by a pressure-applying roll which isarranged to press the end-wing against the adhesive-applying roll andconstitutes means for supplying Aadhesive to the top of the roll. I'hislatter function is accomplished by providing a vertical passage in theblock the lower end of which terminates in the receptacle and the upperend of which tenninates adjacent to the top of the roll and pumpingadhesive through the passage by means of a pair of meshing gearssubmerged in the receptacle adjacent to the lower end of the passage,one of the gears being adapted to rotate the applying roll. Toprovideaccurate folded and resting upon the table of the machine;

Fig. 3 is ,a section taken on the line III-III of Fig. 4;

Fig. 4 is a side elevation as seen from the right side of Fig. 1, partlyin section;

Fig. 5 is a plan view of av portion of the machine with the support forthe work broken away in part to show the adhesive-applying mechanism;

Fig. 6 is a section taken on the line VI-VI of Fig. 4; and

Fig. 7 is a fragmentary view, showing the position of the end-wingbetween the adhesiveapplying roll and the pressure-applying roll.

The work for which the present machine is` particularly suited isillustrated in Fig. 2 as a boxblank which, when set up. is of the typecustomarily employed for packing shoes. The blank B has an end formationconsisting of corner-laps a, and an end-wing b having an extension c,the corner-laps being folded into a position at right angles to thesides of the box, the end-wing being folded so that it overlles thecomer-laps, and the extension being foldedgyer the top edges of thecomer-laps and secured to the inside to provide a 'nished box. Tops forboxes of this type ,are correspondingly formed and set up and may beoperatedupon in the same manner without modification of the machine. Asillustrated and described in my application referred to above, theoperator sets up each end of the box as a separate operation, and to dothis. he preliminarily bends the corner-laps inwardly to a positionsubstantially at right angles to the body of the box and places the boxwith its long dimension in substantially a vertical position with itsinfolded corner-laps in contactwith a table or.` guide t (Fig. l) havinga. horizontal portion Il and an inclined terminal portion I2 whichmerges into the horizontal portion Ill by a, curved connecting portionIl. The curved portion Il between the horizontal portion I of the tableand the upwardly inclined terminal portion I2 thereof receives theinwardly partially folded cornerlaps and, when the operator presses thebox downwardly, completes the folding thereof. The box is then advancedalong the horizontal portion l0 of the table with its end-wing extendingdownwardly in a position to be presented to the adhesive-applyingmechanism G which, as illustrated in my prior application, consists ofan adhesiveapplying roll and a pressure-applying roll between which theend-wing is passed. After the adhesive has been applied, the box ismoved farther along the table to a folding mechanism, indicatedgenerally by the reference character F, which engages the now coatedend-wing and brings it into a position overlying the cornerlaps.Finally, the box passes to the pressureapplying means P which infoldsthe extension c of the end-wing over the edges of the cornerlaps andpresses the superposed parts firmly into engagement to cause permanentadhesion between the parts of the set-up end structure of the box or ofits cover. The folding mechanism F and the pressure-applying mechanism Pare identical with that shown and described in my prior application andneed not be further referred to in the present application.

The adhesive-applying mechanism G which forms the novel subject matterof the present invention is disposed below the table t, as is theadhesive-applying mechanism in my prior machine, and to permit readyaccess thereto the table t is mounted so that it may be tipped upwardlyto expose the adhesive-applying mechanism. 'I'his is accomplished byhinging the rear edge of the table upon spaced brackets I4 (Figs. l and4), the latter being connected by a web I6 ,which, in turn, is fastenedto a horizontal bar by slot-and-screw connections I8. Attached to theunderside of the table just inside of each of the brackets I4 is anangle 26 through which passes a rod 24 having at its outer extremity acrank arm 28 (Fig. 6). Fixed to the rod are two eccentrics 30 rotatablerespectively in the two brackets I4. When the crank arm 2B is raised,the eccentrics are turned, thereby to draw the table suiciently to therear to disengage latching mechanism (not shown herein) so that thetable may be swung up and back about the axis of the rod 24 fully toclear the adhesive-applying mechanism. It is to be observed that a panelI3 is recessed into the table t above the adhesiveapplying mechanism andis removably fastened in place. This permits access to theadhesive-applying mechanism without lifting the table as a whole, ifthat is undesirable under operating conditions.

A horizontal bar 20 fastened to a vertical tubular column 22 (Fig.v l)supports the table t, the adhesive-applying mechanism G, and the foldingmechanism F. The pressure-applying mechanism P is mounted on top of thecolumn. The column, in turn, rises from a base which houses the drivingmeans for the aforesaid mechanisms, the base not being shown hereinsince it is fully illustrated in my prior application.

As illustrated herein, the adhesive-applying mechanism consists, ingeneral, of an adhesiveapplying roll 44 mounted in an adhesive container32 for rotation about a vertical axis and is supported in this positionby a block 'Il mounted adjacent thereto which serves as a bearing forthe adhesive-applying roll. It is to be observed that the block I8 alsoconstitutes a part of the meansfor supplying adhesive to the surface ofthe applying roll, pumping means Il (Fig. 4) being provided in thecontainer for lifting adhesive from the container through a. passage Ilformed in the block '18 to the top of the applying roll where it isdischarged upon the surface of the adhesive-applying roll and allowed todescend by gravity over the surface thereof. A doctorblock 94 isprovided for spreading the adhesive delivered to the surface of theapplying roll and a pressure-applying roll |34 is provided for pressinglthe end-wing against the adhesive-applying rol The adhesive container 32(Fig. 4) is fastened to a projection 34 extending downwardly from theweh I5. To this end, a slot 36 (Fig. 6) is formed in the projection 34for the reception of a key 38 (Fig. 4) which is screwed to one end ofthe container. A threaded stud 40 is formed integral with the key andextends outwardly through the slot 36 for the reception of a knurled nut42 which. when .brought up against the projection by rotation on thestud, clamps the container to the extension. The container may,therefore, readily be attached to or removed from the projection 34 incase it is necessary to replenish the supply of adhesive or to clean thecontainer.

'I'he adhesive-applying roll 44 (Figs. 4 and 7) is vertically positionedso that a portion of its surface lies substantially in the plane of thedepending end-Wing (Fig. 7) as it is moved along the table or guide t,the upper end of the applying roll terminating close to the underside ofthe table and the lower end being submerged in the adhesive in thecontainer, the level of the adhesive being maintained at aboutthe'helght indicated by the dot-and-dash line l (Fig. 6). A hub 46 isprovided at the lower end of the roll and is drivably connected to a hub52 formed on a driven gear 54, submerged in the container, by a key 48which iits into corresponding diametrical slots formed in the respectivehubs. An axial bore 48 is provided at the bottom of the slot in the hubof the applying roll, in which there is seated behind the key acompression spring -EI which forces the upper end of the roll against aplate $2 adjacent to the upper end of the roll, thus preventing endwisemovement of the roll. As shown herein, the upper end of theadhesiveapplying roll 44 is so close to the table or guide t that thecustomary bearing support has been omitted at that end of the rollbecause of the lack of space. Consequently, the roll may readily beremoved from the container by depressing it against the compressionspring so as to clear the plate 82 and then sliding the roll sidewisefrom the key 48.

During the application of the adhesive to the inside face oftheend-wing, considerable lateral pressure is brought to bear upon theadhesiveapplying roll by the pressure-applying roll |34 which, as willappear hereinafter, is urged toward the surface of the applying roll byrela) tively stiff compression springs and is adjustable vith respectthereto to vary the pressure in accordance with the nature of .the work.As shown herein, the bearing block 18 takes up the thrust produced bythe pressure-applying roll,

the bearing block 18 being fixed to supporting' means, as will appearhereinafter, and having a :oncave bearing surface consisting of spacedlands 88, 82 arranged to engage the surface of the adhesive-applyingroll at one side and the back thereof (Fig. As thus supported, the

adhesive-applying roll is held against the rearwardly directed pressureof the pressure-applying roll andthe sidewise pressure produced in thedirection of the movement of the work by its passage between thepressure-applying and adhesive-applying rolls.

'I'he delivery of the adhesive to the surface of the adhesive-applyingroll may conveniently be accomplished by providing a vertical passage88` in the bearing block 18, the lower end of the passage terminating inthe container and the upper end terminating at the top of the applyingroll, and by pumping or lifting the adhesive from the container throughthe passage 88 to the top of the adhesive-applying roll where it isdischarged onto the surface of the roll and allowed to deapplying rollbut also to close the upper end of the passage 88 and the cross passage88.

The circulation of the adhesive from the container through the passages88 and 88 is accomplished by the gear pump 8|, comprising the gear 54which rotates the adhesive-applying roll 44, and a co-operating meshinggear 82, which drives the gear 54. 'I'he two gears are submerged in thecontainer and during their rotation they pick up-adhesive from thecontainer and displace it at their point of mesh in a directionlaterally of their width. Advantage is taken of this by partiallyenclosing the gears, particularly adjacent to their meshing point, andterminating the lower end of the passage 88 that the displaced adhesiveis forced upwardly through the passage. To this end, the gears areseated in lconnected recesses 55, 83 formed in the upper surface of ahorizontal plate 58, the recesses being of a diameter closely to embracethe peripheries of the gears and of such depth that the upper surfacesof the gears are flush with the surface of the plate. It is to beobserved that openings 58 and 85 are provided in the plate 58 to permitfree access of the adhesive in the container to the recesses 55 and 83.these openings being formed at points remote from the point of mesh ofthe gears. To facilitate circulation, the lower end of the passage 88 isdirectly above the point of mesh4 of the gears so ly down the surface ofthe roll.

enlarged at 88 (Fig. 5) so that it overlies a substaiialportion of thegears near their point of me .The gears 54 and 82. which constitute thepump for circulating the adhesive and also the drive for theadhesive-applying roll 44, are supported for rotation on lupright studs58 and 84 fastened to the bottoms of the recesses 55 and 83 in the plate58. These gears .are driven by a gear 88 which meshes with the gear 82and occupies the opening 85. This latter gear is pinned to the end of avertical shaft 88 (Fig. 4) to the opposite end of which is fastened apulley 12, the latter being driven from an outside source of power by abelt 14.

The plate 58 which houses the gears and supports the lower end of theapplying roll 44 is 'bolted to a vertically disposed. forwardlyextending D-shaped frame 18 which, in turn, is bolted to the web i8. TheD-shaped frame also 'providesl the support for the bearing block 18which is attached to its forward portion by screws 18 (Fig. 4) and isprovided in its horizontal arms with bearings for rotatively supportingthe vertical shaft 88.

To spread the adhesive after it has been supplied to the upper end ofthe roll, there is pron an additional bearing support for the adhesive-`applying roll. The doctor block 84 engages the adhesive-applying rollonly at the doctor surface 88 and has a rearwardly extending notched web|88 which is hooked over the vertical rear corner |82 of the bearingblock 18 and may be tilted about this corner as a fulcrum to and fromthe surface of the applying roll. Thus, the combined bearing block 18and doctor block 84 substantially enclose the adhesive-applying rollexcept for a small portion at the front (Figs. 3 and 6) which issuiilcient for applying adhesive to the inner surface of the end-wing.As indicated, there is a clearance 88 between the adhesive-applying rolland the doctor block back of the doctor surface 88 which permits theadhesive supplied to the top of the adhesive-applying roll from the endof the cross passage 88 to run free- It is to be observed here that ahelical thread 45 (Fig. 6) is cut on the surface of theadhesive-applying roll in such a direction that it tends to retard thefiow 4of the adhesivel downwardly over the surface of the roll. A pairof spring ngers |84 (Figs. 3 and 5) are fastened to the web |88 of thedoctor block 84, the free ends of the spring fingers being held againstabutments |88 formed on the D-shaped frame 18 by plates |88 overlyingthe fingers, the plates |88 being secured to the abutment's |88 byscrews H8. This construction affords means for yieldably holding thedoctor block 84 away from the surface of the adhesiveappiying roll, thespring fingers being flexed so that they tend to spring outwardly. Inorder to foibe the doctor block 84 toward the adhesive-applying roll andto adjust its position with respect thereto, a pair of screws ||2 havingknurled heads ||4 are threaded through bosses ||8 formed at the ends ofangle pieces H8 in such a the adhesive-applying roll.

position that the ends of the screws bear against the doctor block 84 ina direction substantially along a diameter of the adhesive-applying roll44. The angle pieces ||8 are fastened to the abutments |08 by the screws||0. It is evident that by rotation of the screws ||2 the doctor blockmay be moved about its fulcrum |02 against the opposition of the springngers |84. The doctor block 84 is also adjustable about a fulcrum ||8(Fig. 6) which comprises a high point formed on the edge of the bearingblock 18 midway between the ends so that the doctor block 94 may betipped in a vertical plane to and from This permits alinement of thelongitudinal surfaces of the roll-and the doctor surface 88.

While the doctor surface 88 provides for a uniform distribution of theadhesive over the surface of the adhesive-applying roll, not all theadhesive is picked up by the work as it is moved in contact therewithand some of this remaining adhesive tends to pile up as the surface ofthe roll moves toward the bearing surface 80 of the bearing block 18.AccordingLv. a clearance is provided at the ingoing side of the bearingblock which permits the adhesive to pass inwardly to a retum recess |20formed in the bearing block 18 close to the bearing surface 80 (Fig. 5).4The surplus adhesive that piles up as the surface of the roll advancestoward the edge of the bearing surface 80 will fill the recess |20 anddescend therein by gravity to the bottom of the roll and into theadhesive container- 'I'he recess |20 not only carries away the excessadhesive but tends to make the film of adhesive on the surface of theroll more uniform, since there is no backing .up of the adhesive.Moreover, the recess encloses the adhesive while it runs back to thecontainer so that there is little danger of the work coming into contactwith it. The amount of adhesive delivered to the surface of the applyingroll may also be controlled and regulated by a by-pass |82 provided inthe passage 88 adjacent to the bottom thereof. As disclosed in Fig. 6,this by-pass |22 is formed in the bearing block 18 just above the levelof the adhesive in the container and may be closed or opened by a slideplate |24 which is secured to the side of the bearing block by ascrewand-slot connection |28. A horizontal tab |28 provides means forlifting or depressing the slide plate |24 to open or close the by-pass|22. It is to be observed that the lower portion of the slide plate |24is curved butwardly and downwardly so that the gush of adhesive from theby-pass |22 will not spatter and will be directed into the adhesivecontainer.

The doctor block 94, which carries the doctor surface 96, as heretoforedescribed. is not fastened against vertical movement, and to preventsuch movement, it is held against the cover plate 92, a portion of whichprojects over the end of thedoctor block, by a spring finger |80fastened to the bottom end of -the doctor block. As seen in Fig. 4, theend of the spring finger rests against a portion of the D-shaped frameand forces the doctor block upwardly.

The pressure-applying roll |34 for holding the end-wing b against theexposed surface of the adhesive-applying roll is supDOrted by a verticalpost |32, the latter being fixed at its lower epd to the horizontalplate 88 (Fig. 4). The upper portion of the post is reduced in crosssection and has telescopically mounted thereon a sleeve |42. At theupper and lower ends of the sleeve parallel slots |4I (Fig. 5) are cutinthe surface thereof at opposite sides for the xecepticn of the arms ofa pair of U-shaped clamps |48 which straddle the sleeve. Between theends of the arms a yoke |88 is fastened. The yoke, in turn.

supports the ends of a spindle |88 upon which is mounted for freerotation the roll |84. 'Ihe sleeve |42 is retained heightwise withrespect to the adhesive-applying roll by a screw |44 having a knurledhead |48. A pair of compresa sion springs |48 are interposed between thesleeve |42 and the yoke |88 between the arms of the U-shaped clamps |48,the springs being seated in recesses |48 formed in the wall of thesleeve |42. By this means the yoke |88, and consequently thepressure-applying roll |84, is yieldably urged toward theadhesive-applying roll. A pair of screws |88 having knurled heads |82are threaded through the rear portion of the U- shaped clamps |48 sothat their ends bear against the sleeve |42, thereby providing means foradjusting the position o; the clamps relative to the sleeve |42. It isevident that by this construction the pressure-applying roll |84 may beadjusted to and from the surface of the adhesiveapplying roll and thatin its adjusted position itis yieldable with respect to theadhesive-applying roll so that in case of an unusual thickness ofmaterial or the presence of some foreign matter the respective rollswill not be damaged. The. provision of the sleeve |42 and the clampscrew |48 permits the vertical position of the pressureapplying roll tobe varied and also permits the pressure-applying roll readily to beswung about the post |82 so that access may be had to the surface ofeach of the rolls if it is necessary to examine them or to clean them.

Heretofore. it has been customary tov incorporate a heating element inthe adheslvecon tainer or the adhesive-applying roll so that theadhesive could be maintained in a fluid condition during its applicationto the work.I As illustrated herein, the heating is accomplished byforming a circuitous passage |84 through the D-shaped frame 18, as shownin Fig. 4, through which a heating element |88 passes and to theterminal ends of which are connected lead wires |88. 'I'he heatingelement in its passage through the D-shaped frame runs along close tothe bearing block 18 and thereby heats the block. The block 18, in turn,heats the adhesive-applying roll. Since the lower portion of theD-shaped frame is submerged in the adhesive, the adhesive in thecontainer 82 is also heated. To control the heat supplied to theadhesive-applying roll, a thermostat |88 (Fig. 6) is inserted in a bore|82 formed in the D-shaped frame, appropriate leads |84 being providedfor connecting the thermo-A stat to the switch (not shown) controllingthe passage of current from the power lines to the lead wires |88.

In using the machine, comparatively few ad- I justments are necessary.The adhesive-applying roll and the adhesive container should first bebrought to a constant temperature by supplying current to the heatingmeans. Thereafter, the belt 14 may be shifted onto a driven pulley (notshown) to rotate the gears and the adhesiveapplying rolll and when theflow of adhesive becomes steady, it may then be increased or decreasedby adjustment of the by-pass valve plate |24. The thickness of thecoating carried by the` surface of the roll into contact with theend-wing may then be regulated by moving the doctor surface to or fromthe surface of the adhesive-applying roll, this being accomplished byrotation of the screws H2. Rotation of both the screws H2 an equalamount will move the doctor surface 96 radially to and from the ad-` bythe screws |50. When the proper adjustments have been made, the operatorpicks up a boxblank b, folds the sides into parallelism, partially foldsthe comer-laps, places the folded cornerlaps against the curved portionIl of the table t, with the longitudinal axis of the box in asubstantially vertical position, and advances the blank while heldagainst the table toward the adhesive-applying mechanism, the end-wingextending vertically downward. During the passage of the end-wingbetween the adhesive-applying roll and the pressure-applying roll,adhesive is applied to the inner surface thereof, the thickness beingdetermined by the previous adjustments. From the adhesive-applyingmechanism the box is ad'vanced to the folding and pressure-applyingmechanism.

Having described my invention, what I claim as new and desirg to secureby Letters Patent of the United States is:

1. In a machine for applying adhesive to boxblanks, a container for anadhesive, an adhesiveapplying roll supported at its lower end in thecontainer for rotation about a vertical axis, the upper end of said rollbeing unsupported, and a block having an arcuate surface engaging thesurface -of the roll and providing a support for the roll againstlaterally applied pressure, said block having a passage therein throughwhich adhesive is delivered to the surface of the roll at its upper end.

2. In a machine for applying adhesive to boxblanks, a container for anadhesive, an adhesiveapplying roll supported at its lower end in thecontainer for rotation about a vertical axis, the upper end of said rollbeing unsupported, a block adjacent to the roll, said block having anarcuate surface, and lands formed on said surface adapted to engage thesurface of the roll and providing a support for the roll againstlaterally applied pressure,l said block having a passage therein throughwhich adhesive is delivered from the container to'the surface of theroll at its upper end.

3. In a machine for applying adhesive to a box-blank, a container for anadhesive, an ad'- hesive-applying roll supported at its lower end in thecontainer for rotation about a vertical axis, a block having an arcuatesurface engaging the surface of the roll and providing a support for theroll against laterally applied pressure, said block having a passagetherein through which adhesive is delivered to the surface of the.

roll at its upper end, and means for continually elevating glue throughsaid passage.

4. In a machine for applying adhesive to a box-blank, a container for anadhesive, an adhesive-applying roll supported at its lower end in thecontainer for rotation about a vertical axis, a block having an arcuatesurface engaging the surface of the roll and providing a support for theroll against laterally appliednpressure, said block having a passagetherein through which adhesive is delivered to the surface of the f rollat 'its upper end, and means for continually elevating glue through saidpassage, said means simultaneously rotating the adhesive-applying roll.

5. In avmachixiev for applying adhesive to a'boxblank. a container foran adhesive, an adhesiveapplying `roll supported at its lower end inthecontainer for rotation about a vertical axis, a gear pump in 'saidcontainer, one of the gears of said pump being arranged to rotate theadhesive-applying' roll', ablock having an arcuate surface engaging thesurface of the roll and providing a support forthe roll againstlaterally applied pressure, and a passage in the block through whichadhesive is delivered to the surface of the adhesiveapplying roll at itsupper end, said gear pump being associated with said passage in a mannerto lift adhesive through the passage to the top of the adhesive-applyingroll.

6. In a machine for applying adhesive to a box-blank, a container for anadhesive, an adhesive-applying roll supported at its lower end'` in the.container for rotation about a vertical axis, a gear pump in saidcontainer and including a pair of meshing gears, one of which isdriven,.means"drivab1y connecting one of said gears to the applyingroll, and a block having an arcuate-surface'engaging the surface of theroll and providing a support for the roll against laterally appliedpressure, said block having a passage therein through which adhesive isdelivered to the surface of the roll at its upper end, the

lower end of the passage terminating adjacent to the delivery side ofsaid pump whereby the adhesive displaced by the meshing gears is liftedthrough said passage.A

7. In a machine for applying adhesive to a box-blank, a container for anadhesive, an adhesive-applying roll supported at its lower end in thecontainer for rotation about a vertical axis, a block arranged to engagethe surface of the roll, said block having a passage therein throughwhich adhesive is delivered to the surface of the roll at its upper end,means fastened to the block and overlying the upper end of the roll, andyieldable means bearing against the lower end of the roll to hold theupper end of the roll in engagement with the last-named means to preventendwise movement thereof.

8. In a machine for applying adhesive to a bex-blank, a container for anadhesive, an adhesive-applyingmoll supported at its lower end in thecontainer for rotation'about a vertical axis, a blockl arranged toengage the surface of the roll and providing a support for the rollagainst laterally applied pressure, said block having a passage thereinthrough which adhesive is delivered to the surface of the roll at itsupper end, there being a by-pass in said passage, and an adjustablevalve member operable to vary the flow of the adhesive through theby-pass.

9; In almachine for applying adhesive to boxblanks, a container for anadhesive, an adhesiveapplying roll supported at its lower end -in thecontainer for rotation about a vertical axis, and a block having anarcuate surface engaging the surface of the roll and providing a supportfor the roll against laterally applied pressure, said block havl'ng apassage therein through which adhesive is delivered to the surface ofthe roll at its upper end and a recess in its arcuate surface adjacentto the edge thereof toward which the surface of the roll advances, saidrecess running trom top to bottom of the block.

10. In a machine for applying adhesive to boxblanks, a container for anadhesive. an adhesiveapplying roll supported at its lower end in thecontainer for rotation about a vertical axis, and a block having anarcuate surface engaging the surface of the roll and providing a supportfor the roll against laterally applied pressure, said block havingV apassage therein through which adhesive is delivered to the surface ofthe roll at its upper end and a recess in its arcuate surface adjacentto the edge thereof toward which the surface of the roll advances, saidarcuate surface being relieved from said edge inwardly to said recessand said recess running from top to bottom of the block.

11. In a machine for applying adhesive to boxblanks, a container for anadhesive, an adhesiveapplying roll supported at its lower end in thecontainer for rotation about a vertical axis, and a block having anarcuate surface engaging the surface of the roll and providing a supportfor the roll against laterally applied pressure, said block havingpassages therein, one of said passages terminating at one end in thecontainer and at its other end adjacent to the upper end of the roll,said other passage being connected at one end to the upper end of therst passage and terminating at its other end adjacent to a portion ofthe surface of the roll moving away from the block.

12. In a machine for applying adhesive to boxblanks, a container for anadhesive, an adhesiveapplying roll supported at its lower end in thecontainer for rotation about a vertical axis, a block partiallysurrounding the roll, said block having a surface engaging the roll atspaced points and providing a support for the roll against laterallyapplied pressure and having a passage therein through which adhesive isdelivered to the surface of the roll at its upper end, and a doctormounted adjacent to the roll between the point at which the adhesive isdelivered to the surface of the roll and the edge of the block towardwhich the surface of the roll advances.

13. In a machine for applying adhesive to boxblanks, a container for anadhesive, an adhesiveapplying roll supported at its lower end in thecontainer for rotation about a vertical axis, a block partiallysurrounding the roll, said block having a surface engaging the roll andproviding a support for the roll against laterally applied pressure,there being a passage in the block through which adhesive is deliveredto the surface of the roll at its upper end, a second block movablymounted upon the rst block, said second block having a. surface arrangedto bear against the surface of the roll at a point in advance of thepoint of delivery of adhesive to the surface of the roll in thedirection of rotation of the roll, and means arranged to vary theproximity of the surface of the block to the surface of the roll.

14. In a machine for applying adhesive to boxblanks, a container for anadhesive, an adhesiveapplying roll supported at its lower end in thecontainer for rotation about a vertical axis, a block partiallysurrounding the roll, said block providing a support for the rollagainst laterally applied pressure, there being a passage in the blockthrough which adhesive is delivered to the surface of theroll at itsupper end, a second block movably mounted upon the ilrst block', saidsecond block having a surface arranged to bear against the surface ofthe roll at a point in advance of the point of delivery of adhesive tothe surface of the roll in the direction of rotation of the roll,'meansfor bodily moving the surface of the second block to and from thesurface of the roll, and means for tilting the surface of the secondblock with respect to the surface of the roll about a horizontal axismidway between itsends.

15. In a machine for applying adhesive to boxblanks, a container for anadhesive, an adhesiveapplying roll supported at its lower end in thecontainer for rotation about a vertical axis, a block partiallysurrounding the roll, said block having a surface engaging the roll andproviding a support for the roll against laterally applied pressure,there being a passage in the block through which adhesive is deliveredto the surface of the roll at its upper end, a second block fulcrumed onan edge of the rst block, yieldable means arranged to tilt the secondblock on its fulcrum away from the surface of the roll, and means forholding the second block in a predetermined position with respect to thesurface of the roll.

16. In a machine for applying adhesive to boxl blanks, a container foran adhesive, an adhesiveapplying roll supported at its lower end in thecontainer for rotation about a vertical axis, a block partiallysurrounding the roll, said block having a surface engaging the roll andproviding a support for the roll against laterally applied pressure,there being a psige in the block through which adhesive is deliveredtothe surface of the roll at its upper end, a second block supportedupon an edge of the first block. said edge having a high point thereon,and means for tilting the second block about the high point on the edgeof the first block to bring the surfaces of the second block and theroll into parallelism.

17.' In a machine for applying adhesive to boxblanks, a container for anadhesive, a vertical adhesive-applying roll one end of which dips intothe container, a support submerged in the container, a recess in thesupport, a pair of meshing gears mounted for rotation in said recess,means drivably connecting one of said gears to the lower end of theroll, a block engaging the\ surface of the roll and providing a supportfor the roll against laterally applied pressure, there being openings inthe recess exposing a portion of the teeth of each gear to the adhesivein the container, and means for rotating the gears whereby adhesivepicked up by the exposed teeth is carried to their point of mesh anddisplaced laterally, there being a passage in the block the lower end ofwhich terminates closeto the point of mesh of the gears and the upperend of which terminates at the upper end of the roll, said laterallydisplaced adhesive being elevated through y said passage by the rotationof the gears.

18. In a machine for applying adhesive to boxblanks, a container foradhesive, an adhesive applying roll rotatable in the container about avertical axis, and a block having an arcuate surface engaging thesurface of the roll and pro-r viding a support for said roll againstlaterally applied pressure, the block having a passage through whichadhesive is delivered to the roll.

CUTLER D. KNOWLTON.

CERTIFICATE oF CORRECTION. Patent No. 2,552,720. July LI, 19141;.

. CUTLER D. RNowLToN.

It is hereby certified that error appears in the printed specificationof the above numbered patent requiring correction as follows: Page l,first column, line 18, for the word "herein" read --therein; and thaltthe said Letters Patent should be read with this correction therein thatthe same may Conform to the record of the case in the Patent Office.Signed andsealed this 22nd day o August, A. D. 19h14.

Leslie Frazer `(Seel). v y Acting Commissioner of Patents.

